Build advice for power fantasy.
(Spoiler because undead character design)
I have this character who is supposed to represent the balance of life and death, basically the grim reaper. Not good, not bad, just true neutral death. He is in that regard a force of nature. The power fantasy is that he can punch people with either necrotic damage (to give death to the living) or radiant damage (to give death to the undead.) and have some healing to save and spare those who are not meant to die yet.
How would you guys go about making that? Re-flavouring abilities is allowed fully, and I usually play with lenient DM's so homebrew and rule changes are allowed as long as I don't out preform other characters or it becomes unbalanced.
He is a servant of Jergall so I'm kinds circling classes like cleric and monk to facilitate the punching. But like maybe there is a very capable full class martial build, with the needed damage types where the only thing we need to re-flavour are that the weapon attacks are punches. The only thing I care about is that his species is re-born, maybe warforged or something if that facilitates the build better, but he needs to feel undead.
I just kinda feel with the right feat and subclass this should be possible without too much homebrew, but the dots are just not connecting for me.
I'd love to hear your idea's!